Deepace KC901M User Manual page 25

Chart 4-1: Example for connection method of duplexer measurement
Adjust the three screws nearest to the TX port (the first three on the left in
Chart4-1) until the dip point moves to Mark1 (M1) (Chart4-2). Fine-tune the screws
step by step meanwhile monitor M1's S reading till it makes to the minimum negative
number. Normally it can reach -60dB. Right now, M1 indicates the insulation of the
HIGH side, and mark2 (M2) indicates the insertion loss of HIGH side.
Connect KC901M's output port to duplexer's ANT port, and then connect the
input port to the RX port and the dummy load to the TX port. Adjust the three screws
nearest to the RX port (the last three on the right in Chart4-1) until the dip point
moves to M2 (Chart4-2). Fine-tune these three screws from left to right one by one
repeatedly, at the same time, monitor M2's S reading till it probes to the minimum
negative number. Also generally, it can reach -60dB.
Adjust the central frequency and sweeping span to zoom in the new curve. Then
adjust the positions of maker1 and marker 2. Finally connect the testing cables with a
thru-coupling to perform user calibration.
Then connect instrument's output port to duplexer's TX port, the input port to
the ANT port and the dummy load to RX port. Fine-tune the three screws from left to
right repeatedly till the M1's S reaches the minimum. In normal situation it should be
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